The average bounty allocates the most tokens for Twitter, Facebook, Signature, Youtube and Article campaigns.
is there a bounty that allocates higher tokens to the Signature campaign?
it will depend on the project where they want to be the focus or advertise most, and give the higher percentage of the campaign, mostly they give lots of percentage in bitcointalk campaigns or some other social platform, or those like translation, making videos of the projects, at the end of the day the manager of the campaign will only follow the companies choices or allocation.